Gas-engine.



PATENTED JUNE 18, 1907. B. P. STEWART.

GAS ENGINE APPLICATION FILED SEPT. 2,1904.

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(Ztforawy No. 857,120. PATENTED JUNE 18, 1907. B. F. STEWART.

GAS EN GINB.

APPLICATION FILED SEPT. 2,1904.

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we'k'aeaaeau Ii 11. w-2107 No. 857,120. PATENTED JUNE 1 8, 1907. B. F.STEWART. GAS ENGINE.

APPLICATION FILED SEPT. 2, 1904.

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BENJAMIN F. STEWART, or CHICAGO, JLLINOIS.

GAS-ENGINE.

' Specification of LettersPatent.

Patented June 18, 1907.

Application filed September 2, 1904. Serial No. 223,119.

To all whom it may concern:

Be it known that I, BENJAMIN F. STEWART, a citizen of the UnitedStates,'and a resident of Chicago, county of Cook, and State ofIllinois, have invented certain new and useful Improvements inGas-Engines, of which the following'is a specification, and which areillustrated in the accompanying drawings,

, forming a part thereof.

-- Thisinvention relates to the two-cycle of gas engine; and its objectis to pro 6, for. the compression of the air for each charge lieforeintroducin thecornbustible. material, the latter being elivered to theassage through which the air entersthe exp odmg chamber.

I A further object is to provide for the regullation of the air supplyin a two-cylinderengme.

The mVQHtiOI1- COI1S1StS 1n the structure hereinafter described andwhich is illustrated in the accompanying drawings, in which- Figure 1 isa longitudinal section of the engine on the plane of the crank shaft;-Fig. 2 is a plan section on the line.22 of Fig. 1; Fig. 3 1s a plansection .on. the line 33 ofEig". 1; .Fig. 4. is a longitudinal centralsection on aplane transverse to that of Fig; and 5 cylinders areessential duplicatesthe descrip- .tiofl iis ,,for the most part,restrictedto one of and 6 are details of the valve controlling thefuelsu pl. f the major part'oi the invention isapplicable to a singlecylinder engineyl have shown, in the drawings, a two-cylinder engine,.or, more properly, a pair of engines com-- prised within a singlecasting. As the two There are shown in the drawingstwo cylin- I the.cyhnders within which the combustion takes place, and provides forcooling the same.

The crank shaft is shown at '13 .and is common to the two cylinders, asare also the ex-- haust chamber14 and the air-sup l chamber 15, whichare shown as locateg'b etween the two cylinders. The piston is shownat'16, its pitman at 17, and crank at 18.

The crank is located within the compression chamber, the casing of whichis shown at 19 and to which air is admitted through the rt, 20, leadingthrough the cylinder wall omthe chamber 15, and ,is uncovered by thepiston when the latter is at the limit of its instroke. The airiscompressed by the piston during its outstroke, and is delivered from thecompression chamber to the explosion chamber through a passage 21, coredin the walls The fuel, usually gasolene, is admitted to I the passage 21at 25, enterin throu h a' duct 26 in aplug 27, having a nipp e 28 aapted to be connected with the fue tank, The duct 26 opens through theinner end of the plug 27 andjis controlled by a valve 29, the stem, 30,of which passes outwardly through the plug and carries at its outer 'endan expansion s ring 31, which holds the valve to 1ts seat.

he valve is unseatedby the suction due to the instroke of the piston,and to tacilitate this-action the plug 27 is preferably recessed so thatair may be admitted through the duct 32 to the back of the valve 29. Asthe liquid enters through the duct 26 it will trickle down the Walls ofthe passage 21 andwiil then be taken up by the 8.11 as it rushes throughthis passage to the explosion chamber.

While a small quantity of air will be admitted by the rising of thevalve 29, it will not be sufliclent' to combine with the liquid. to forman explosive mixture, and I am therefore able .to accomplish thecompression of the air beforeit becomes charged with the fuel and henceavoid danger of explosions within the compression chamber, as the chargedoes not become ex losive until it en ters 'thechamber of the cy inder.

The air supply, in an engine organized as described, may be regulated bymeans of a U-shaped slide valve 33, located within the chamber 15, andbeing made of elastic material so that it automatically closes the airinduction ports 20 for each cylinder. This "valve may be provided with astem 34', by

means of which it may be adjusted, and its own elasticitywill hold it inany position in which it may be set.

inte -'al' a journal box 35 is provided for the or a shaft 13intermediate of, the two In casting the shell of the pair of enginescranks, and in order that this box may be the better reinforced andsupported I space the two casings 19, 19, of the compression chamber,apart, thereby providing a supporting plate at each end of the box.

. I claim as myinvention- 1. In a gas engine, in combination, a-pair ofpower cylinders cast integral, a com ression chamber for each cylinder,an air 0 amber between the cylinders,' a port leading from the airchamber to each compression chamber.

2. In a gas engine, in combination, a pair of power cylinders castintegral, a com ression chamber for each cylinder, an air 0 amber and anexhaust chamber between the cylinders, ports opening from the airchamber to each compression chamber, and ports conznecting the exhaustchamber with the exchamber between the cylinders and adjacent the innerends thereof, ports leading from the air and exhaust chambers throughthe walls of 'each cylinder and so arranged as to be uncoveredalternately ends of their strokes.

4. Ina gas engine,- in combination, a pair by the pistons at the ofpower cylinders cast integral, a compression chamber for each cylinder,an air chamber between the cylinders, a port leading from the airchamber to each compression cylinder, an expansible U-shapeddouble slidevalve fitted within the air chamber and adapted to cover its ports.

5. In a gas engine, in combination, a pair ofjuxtaposed power cylinders,a compression chamber for each cylinder, an air chamber between thecylinders, and a port leading from the airchamber to each of thecompression chambers, theports being controlled by the pistons of thecylinders and being opened alternately.

6. In a gas engine, in combination, a pair of cylinders havin a commonWall, a compression chamber or each of the cylinders,

an induction passage formed in the wall between the cylinders, and aportleading from the passage to each of the compression cham ers.

BENJAMIN F. STEWART.

Witnesses:

LoU1s GILLsoN, E. M. KLATOHER.

